Those particular lines look like they were a screenshot of Photoshop's grid. Just enable the grid, and take a screenshot of it. You can then either use the screenshot directly or turn it into a pattern and use the Fill tool to fill with pattern.

If you want to do that from scratch grab your line tool and draw a grid. That's all a grid is. Again you can turn it into a pattern.

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linqueCommented: 2002-06-11

You can achieve that effect using a photoshop "action". Check out this page where you can download such an action.